Optical fiber preform, homogenized optical fiber as well as preparation method and application of homogenized optical fiber

Abstract

The invention relates to the field of optics and laser photoelectrons, in particular to an optical fiber preform, a homogenized optical fiber and a preparation method and application of the homogenized optical fiber. The optical fiber preform comprises a main fiber core rod and an auxiliary fiber core rod; wherein the main fiber core rod is provided with a fiber core hole, the auxiliary fiber core rod is arranged in the fiber core hole, and the axis of the main fiber core rod is parallel to the axis of the auxiliary fiber core rod. The relative refractive index difference of the main fiber core rod is lower than the relative refractive index difference of the auxiliary fiber core rod. The preparation method of the optical fiber preform comprises the following steps: carrying out core rod deposition in a liner tube to obtain two preform core rods, namely a main fiber core rod and an auxiliary fiber core rod, wherein the relative refractive index difference of the main fiber core rod is smaller than the relative refractive index difference of the auxiliary fiber core rod; punching the main fiber core rod; and loading the auxiliary fiber core rod into the perforated main fiber core rod, and drawing the assembled prefabricated rod into the homogenized optical fiber through a wire drawing tower. After a light beam passes through the homogenizing optical fiber, the output laser can be shaped into a flat top state from a Gaussian state. The device is simple in structure, stable and reliable.

Description

technical field [0001] The invention relates to the fields of optics and laser optoelectronics, in particular to an optical fiber preform, a homogenized optical fiber and a preparation method and application thereof. Background technique [0002] In the process of cutting metal materials with high-power continuous fiber lasers, especially when cutting thicker (thicker than 18mm) metal materials, etc., it is required that the energy of the laser spot coming out of the QBH fiber (fiber laser cable) must be uniform, and the energy must be concentrated to a certain extent. Spend. [0003] Usually, the unprocessed laser light comes out of the fiber laser in a Gaussian distribution. Due to the characteristics of the Gaussian beam, when the continuous high-power laser cuts the material, the two sides of the central part of the Gaussian beam may also damage the surrounding area other than the target area. Thereby extending the heat-affected zone. [0004] This is very unfavorable ...

AI Technical Summary

Problems solved by technology

However, since the continuous high-power laser is used in industrial production and needs to be moved at any time, and the environment and other factors in industrial production are changeable, the combination of lenses and diffractive optical devices in the laser is prone to unstable factors, which eventually leads to the inability to complete the Gaussian beam stably. conversion

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